Upsilon Geminorum

Not to be confused with U Geminorum.
υ Geminorum
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 07h 35m 55.35001s[1]
Declination +26° 53′ 44.6802″[1]
Apparent magnitude (V) 4.04[2] (4.04 - 4.08[3])
Characteristics
Spectral type M0 III[4]
U−B color index +1.96[2]
B−V color index +1.54[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)−21.61±0.19[5] km/s
Proper motion (μ) RA: −32.841 mas/yr[1]
Dec.: −106.002 mas/yr[1]
Parallax (π)12.8761 ± 0.2288 mas[1]
Distance253 ± 5 ly
(78 ± 1 pc)
Absolute magnitude (MV)−0.53[6]
Details
Mass1.52[7] M☉
Radius39.62+0.74
−0.76[8] R☉
Luminosity369.6±18.5[8] L☉
Surface gravity (log g)1.0[5] cgs
Temperature4,019±38[8] K
Metallicity [Fe/H]0.17[7] dex
Rotational velocity (v sin i)5.9[5] km/s
Age3.53[7] Gyr
Other designations
υ Gem, 69 Geminorum, BD+27° 1424, FK5 1196, HD 60522, HIP 36962, HR 2905, SAO 79533.[9]
Database references
SIMBADdata

Upsilon Geminorum, Latinized from υ Geminorum, is a star in the constellation Gemini. It has an apparent visual magnitude of 4.04,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.88 mas,[1] it is around 253 light years from the Sun. There is a visual companion: a magnitude 13.20 star located at an angular separation of 55.20″ along a position angle of 40°, as of 2008.[10]

This is an evolved red giant star with a stellar classification of M0 III.[4] It is estimated to have 1.52[7] times the mass of the Sun, but has expanded to 40[8] times the Sun's radius. The star is spinning with a projected rotational velocity of 5.9 km/s[5] and is about 3.53[7] billion years old. Upsilon Geminorum is radiating 370 times the solar luminosity from its outer atmosphere at an effective temperature of 4,019 K.[8]

Based upon the motion of this star through space, Upsilon Geminorum is a member of the Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around 2.7±0.5 billion years. They may be former members of a dissolved open cluster.[11]

  1. ^ a b c d e Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Morgan1973 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference baines was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Bubar2010 was invoked but never defined (see the help page).